STEVAL-ISA198V1

STEVAL-ISA198V1 2 A step down DC - DC switching regulator (VIN = 4.5 V to 60 V) based on the L7987L Data brief Description The STEVAL-ISA198V1 product evaluation board is a step-down switching power supply based on the L7987L regulator in an HTSSOP16 package. The output voltage can be set starting from 0.8 V. Low drop-out operation, due to the advanced integrated switch management, can be achieved. The L7987L is a 61 V, 2 A step-down asynchronous switching regulator with embedded power MOSFET capable of delivering up to 2 A of current, depending on the application conditions. The embedded switch-over feature on the VBIAS pin and the light load management (pulse skipping) help maximize power conversion efficiency across the entire load range. The soft-start, current limit threshold and switching frequency are adjustable for application optimization. Features           4.5 V to 60 V input voltage Step-down (buck) conversion 5 V output voltage (VIN > 6 V) Up to 2 A DC output current 500 kHz switching frequency 5 ms programmed soft-start Compliant with ceramic output capacitors 180° out of phase synchronization available Auto recovery overcurrent and thermal protection RoHS compliant November 2016 The device includes an internal 250 kHz oscillator that can be externally adjusted up to 1.5 MHz; two L7987L regulators can be synchronized in a 180° out-of-phase configuration for reduced total input RMS current. DocID030001 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com GND EN VIN TP6 TP5 J1 4.7uF 100 V C1 TP3 4.7uF C2 TP2 100 V 1uF C3 SYNCH 100 V 1uF 100 V C4 33nF C10 R4 0 47k R8 27k R9 11 10 6 5 4 2 3 7 ILIM FSW SS EN VCC VIN VIN SYNCH U1 17 16 EP GND L7987L NM 8 9 13 14 15 1 12 D1 100nF C7 STPS2L60UF COMP FB LX LX BOOT VBIAS PGOOD C11 10k R10 NM 68pF C9 L1 signal GND power GND R6 J3 6.8nF 15uH R2 R7 R11 13k R5 J2 100k 910 68k C8 680pF 47uF C5 R1 N.M. DocID030001 Rev 1 C6 2/4 VOUT PGOOD + TP7 GND VOUT = 5 V IOUT,MAX = 2 A Fbw = 60 kHz Ph = 60 deg TP4 TP1 N.M. 1 C12 IOCP = 3 A Tss = 5.3 ms Fsw = 500 kHz Schematic diagram STEVAL-ISA198V1 Schematic diagram Figure 1: STEVAL-ISA198V1 circuit schematic GSPG1310161600SG STEVAL-ISA198V1 2 Revision history Revision history Table 1: Document revision history Date Version 11-Nov-2016 1 Changes Initial release. DocID030001 Rev 1 3/4 STEVAL-ISA198V1 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. © 2016 STMicroelectronics – All rights reserved 4/4 DocID030001 Rev 1